For anyone stuck in this dark pattern here is a trick I've used in the past: Adobe won't let you cancel without paying the remainder of your subscription fee however you can switch to a different plan. As soon as you switch you'll have the ability to cancel your "new" plan within 14 days. If you cancel after 14 days they'll charge you the early termination fee.
Anyway a "free" trial that asks for your cc number is obviously not free. Better to stay away of those to be on the safe side.